That is the purpose of the threads. It is the link to the front page article. If you post in this thread the post becomes a 'comment' to the article. This problem (multiple threads for one article) is known and reported. Robdog is looking into it.

I have excluded that from the search index probably should of thought of the easy option to simply switch that on. However, I think that I have to rebuild the search index which I will do tonight. (takes a little while and some processing power)